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Disclaimer: I don't own Castle or the characters.

As soon as Beckett had left to talk to Kate, Castle turned to Rick, "So, be straight with me, you're sleeping with Beckett right?"

The first clue that gave Castle the idea that he and Beckett were together was the fact that she'd been at his place for a movie night. It could've been something they did just as friends but for Beckett to be comfortable enough to wear so little clothes around Rick and the fact that there had only been one blanket on the couch it looked like they were sharing, Castle knew something was up.

Then there were other things like the fact that they were going to share a bed. Okay, so that could be a completely platonic thing but the Beckett he knew would never share a bed with him if there was another option. Of course she wasn't the Beckett he knew. They'd had years to build a friendship and them still being friends after this long says that Kate at least likes him as a friend.

And then of course there'd been the stuff with Gates. Castle knew exactly what had been going on in the precinct. He wasn't blind, he could tell there was something going on between Kate and Rick, he just hadn't brought it up with Beckett yet. He would bring it up later but he could tell she was struggling to come to terms with everything that was happening at the moment and didn't want to add to the stress. There'd be teasing later, I mean she agrees to sleep with him at some point in the future so he must've done something right and she obviously thought he was sexy, he certainly thought she was.

And then there was when they went back to his loft. He noticed little things that said that he didn't live alone (not counting his mother). There was also the picture of them together that he had seen before Beckett had turned it face down. He'd caught her staring at it so he knew that she knew about their future together too. He'd seen another photo of them as well, one that Beckett hadn't seen. It was of the group from the precinct but he saw that Kate and him were holding hands and Rick was looking down at Beckett with so much love in his eyes, he knew she meant something special to him.

Castle was glad that one day he wouldn't have to hide how he felt about her. Okay, so right now, he obviously didn't feel that strongly for her but he hadn't known her very long yet. He was glad that he'd get the opportunity to be with her and show her the love she deserves.

Rick talking brought Castle back to the present. Rick was pretty glad he didn't have to hide his relationship from himself and was relieved that he had discovered the truth, "I wondered why you hadn't figured it out yet. I didn't think I was that slow back then," Rick answered.

"I'll take that as a yes then," Castle smiled smugly, knowing that one day he'd get the gorgeous detective in bed with him. "Any good?" he asked.

"So good, so very good," Rick answered, mind thinking back to various times they'd slept together. He also couldn't help but think how weird this was, talking about this kind of thing with himself.

"And it's obviously serious?" Castle asked, he already knew it was pretty serious but he wasn't expecting the answer he got.

"Very, we're getting married," said Rick, and Castle couldn't hide the shock on his face at hearing that he was, yet again, getting married.

"Again? I thought we were over that," answered Castle, if he was even considering getting married again, this girl must be pretty special, but he kind of knew that already.

"Trust me, I know you like her now I mean she's hot and so bad ass but the Beckett underneath that is so, so amazing. I've never met anyone quite like her, she's extraordinary," said Rick and Castle noticed the faraway look in his eyes as he talked about Beckett, well Kate. But anyway, he could tell his future self was completely in love.

"I didn't think it was possible, I thought maybe one day I'd maybe convince her to sleep with me but that'd be it, but to have an actual relationship with her. And to be even considering marriage it must be serious," continued Castle, still trying to wrap his head around the idea that he was getting married again, and the person he was marrying was Beckett.

"We're her "one and done" and she's our "third time's a charm"," Rick said. Castle recognized the "one and done" part from the park during the nanny case, which funnily enough also featured a Mr Peterson but had no relation to their current case, and he assumed the other part was because he'd already been married twice.

"How did we go from her hating me, well us, to getting married?" Castle asked, wondering how that was even possible. Beckett seemed to really not like him at the moment and it looked like she was about ready to kick him out of the precinct. Of course Castle didn't want that and it seemed that something had changed her mind since he was still working with her.

"A lot of hard work but it's all worth it," answered Rick, breaking Castle from his thoughts, "There's a lot of heart break and pain and you almost lose her, but there's a lot of happiness too. And trust me, you've never been more in love than you are now" said Rick, smiling as he thought of Kate again.

Castle sat there thinking about all Rick had just said. Of course he wondered about the bad stuff Rick was referring to but he also wondered about the happy times too. And they did look happy now, both of them, and he couldn't wait for Beckett and him to have that too.

Beckett's talk with Kate is going to be the next chapter and for those of you who were worried, Martha will return!

Also, there is an actual plot for the story with the time travel and Mr Peterson etc so don't worry about that either.

If you liked it/or if you didn't, don't forget to review to let me know and thanks for reading.